[V3,0/3] Replace VT-d workaround with guard pages

Message

Tejas Upadhyay Feb. 24, 2022, 10:52 a.m. UTC

Replace filling the GGTT entirely with scratch pages to avoid invalid
accesses from VT-d overfetch of scanout by only surrounding scanout vma
with guard pages. This eliminates the 100+ms delay in resume where we
have to repopulate the GGTT with scratch.

This should also help in avoiding slow suspend/resume on GEN11/12
platforms. Which will also resolve issues with following reported 
errors : "slow framebuffer consoles issue impacts Linux S3"

V3: Rebased on drm-tip
V2: solved checkpatch warning

Chris Wilson (3):
  drm/i915: Wrap all access to i915_vma.node.start|size
  drm/i915: Introduce guard pages to i915_vma
  drm/i915: Refine VT-d scanout workaround

 drivers/gpu/drm/i915/display/intel_dpt.c      |  7 ++-
 drivers/gpu/drm/i915/display/intel_fbdev.c    |  6 +-
 drivers/gpu/drm/i915/gem/i915_gem_domain.c    | 13 +++++
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 33 ++++++-----
 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_shrinker.c  |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_tiling.c    |  4 +-
 .../gpu/drm/i915/gem/selftests/huge_pages.c   |  2 +-
 .../i915/gem/selftests/i915_gem_client_blt.c  | 15 ++---
 .../drm/i915/gem/selftests/i915_gem_context.c | 15 +++--
 .../drm/i915/gem/selftests/i915_gem_mman.c    |  2 +-
 .../drm/i915/gem/selftests/igt_gem_utils.c    |  7 ++-
 drivers/gpu/drm/i915/gt/gen6_ppgtt.c          |  4 +-
 drivers/gpu/drm/i915/gt/gen7_renderclear.c    |  2 +-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 12 ++--
 drivers/gpu/drm/i915/gt/intel_ggtt.c          | 48 +++++++---------
 drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c  |  3 +-
 drivers/gpu/drm/i915/gt/intel_ppgtt.c         | 12 +++-
 drivers/gpu/drm/i915/gt/intel_renderstate.c   |  2 +-
 .../gpu/drm/i915/gt/intel_ring_submission.c   |  2 +-
 drivers/gpu/drm/i915/gt/selftest_engine_cs.c  |  8 +--
 drivers/gpu/drm/i915/gt/selftest_execlists.c  | 18 +++---
 drivers/gpu/drm/i915/gt/selftest_hangcheck.c  | 15 ++---
 drivers/gpu/drm/i915/gt/selftest_lrc.c        | 16 +++---
 .../drm/i915/gt/selftest_ring_submission.c    |  2 +-
 drivers/gpu/drm/i915/gt/selftest_rps.c        | 12 ++--
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  8 +--
 drivers/gpu/drm/i915/i915_cmd_parser.c        |  4 +-
 drivers/gpu/drm/i915/i915_debugfs.c           |  2 +-
 drivers/gpu/drm/i915/i915_gem_gtt.h           |  1 +
 drivers/gpu/drm/i915/i915_perf.c              |  2 +-
 drivers/gpu/drm/i915/i915_vma.c               | 55 ++++++++++++++-----
 drivers/gpu/drm/i915/i915_vma.h               | 25 ++++++++-
 drivers/gpu/drm/i915/i915_vma_types.h         |  3 +-
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 12 +++-
 drivers/gpu/drm/i915/selftests/i915_request.c | 20 +++----
 drivers/gpu/drm/i915/selftests/igt_spinner.c  |  8 +--
 37 files changed, 245 insertions(+), 159 deletions(-)